Photographic process



. Patented duly ll, llg i.

' 5 aaeaaaa W canton.

ramnnrc EUGENE was, on rn No Drawing.

T all whom it may concern:

Be it known that I, Fnnnnnro EUGENE Ives, a citizenof the United States.residing at Philadelphia, county of Philadelphia, State of Pennsylvania,have invented a new and useful Photographic Process, of which thefollowing is a specification. I

My invention has for its main object the conversion by a single bath orprocess of a 1 photographic silver image in a colloid layer containingalso silver bromide, to a pigment blue print and silver bromide.

This I accomplish by immersing the unfixed silver print in a chemicalblue-toning 1 bath which contains in addition to the other necessaryingredients one or more suitable haloids, or halids.

' The silver print is made by ex osure and development of agelatine-bromi e or other ,2 suitable sensitive layer, which may be oneither an opaque or a transparent carrier, and after development andwashing, but

without fixing, and preferably without exposure to actinic light, isimmersed for a sufiicient period in a bath containing the necessaryingredients. A suitable bath for this purpose consists of:

Potassium bromide 7 grammes U. S. P. ferric chloride solu.-- 20 c. 0.5.

An immersion of ten minutes is usually suflicient to complete thereaction, but a longer immersion is to be recommended. The product is apigment blue print buried in an even layer of light-sensitive silver broI a mide, in which another image can be subsequently produced byexposure and development, employingpreferably the acid diamidophenoldevelo print, which won d be permanently reduced 4 to some extent in astrongly alkaline developer, but recovers nearly its original strengthby simple washing in running water when the amidol developer has been m10 ed.. e 8

ed results can be obtained with formula considerably modified from thatgiven,

er to conserve the blue? ELPHIA, rnnnernvanra PHGTOGEAJPHIC racemes;

, Application filed @etcber 25,,192S-...Serial noferaeae.

but the formula given possesses the advantage that it substantiallyavoids a tendency to selective hardening of that part of" the colloidcontaining the blue print, and leaves the evenly distributed silverbromide content in the most favorable condition for the production of aperfect second image,which is another object of my invention. The silverbromide layer after the above treatment is somewhat less sensitivetolight than it-was originally, but quite suficiently sensitive for mypurpose. a

Having thus described my invention, what- I claim as new and desire tosecure by Letters Patent, is 1 1. The conversion of a photographicsilver print in a colloid layer containing also silver bromide to apigment blue print and silver bromide by treatment in a bath containingin combination the necessary ingredients for producing the blue image,and a bromide.

2. The conversion of a photographic silver print in a colloid layercontaining also silver bromide to a pigment blue print and silverbromide by treatment in a ath containing in combination the necessaryingredients for producingthe blue image, and a bromide, followed byexposure and development to produce a second image in the same colloidlayer.

3. The conversion of a photographic silver print in a colloid layercontaining also silver bromide to apigment blue print and silver bromideby treatment in a bath containing in combination the-necessaryingredients for producing the blue image, and a bromide and a chloride.

4. The conversion of a photographic silver print in a colloid layercontaining also silver bromide to a pigment blue print and silverbromide, by treatment in a bath containing in combination the necessaryingredients for producing the bluev ima e, and a bromide and a chloride,followed y exposure and development to roduce a second image in the samecolloid ayer.

FREDERIC EUGENE IVES Witnesses:

as. Fmnem, JOHN WmDm: email-1

